Mechanical metamaterials consist of specially engineered features designed to tailor and enhance the mechanical properties of their constituent materials. In this context, 2D pantographic fabrics have gained attention for their unique deformation behavior, providing remarkable resilience and damage tolerance. This study explores micro-metric metamaterials with 3D pantographic motifs, aiming to transfer these properties to small scales. 3D micro-metric structures were designed using 2D pantographic fabrics arranged in multiple layers, each featuring unit cells with quasi-perfect pivots. Relatively large specimens of 3D micro-metric pantographs, measuring 158 \(\upmu \)m x 250 \(\upmu \)m x 450 \(\upmu \)m, were fabricated in various configurations using two-photon polymerization. These specimens were mechanically characterized through in-situ scanning electron microscopy microindentation under conditions of cyclic deformation. Structural failures were subsequently assessed via helium-ion microscopy. The 3D micro-metric pantographs exhibited complex mechanical properties, some aligning with those of 2D pantographic fabrics, while new properties, such as a dissipative response and softening, were identified. Nonetheless, the 3D micro-metric pantographs demonstrated great resilience against deformation and enhanced resistance to undesired out-of-plane motions, indicating their potential for novel applications in advanced engineering fields. Additionally, the findings can potentially lead to optimizing and enriching theoretical models describing the mechanical behavior of pantographic metamaterials.

机械超材料由专门设计的功能组成，旨在定制和增强其组成材料的机械性能。在这种背景下，二维缩放织物因其独特的变形行为、提供卓越的弹性和损伤容限而受到关注。这项研究探索了具有 3D 缩放图案的微米超材料，旨在将这些特性转移到小尺度上。 3D 微米结构是使用多层排列的 2D 缩放织物设计的，每层都具有带有准完美枢轴的单位单元。使用双光子聚合以各种配置制造了相对较大的 3D 测微受电弓样本，尺寸为 158 \(\upmu \) mx 250 \(\upmu \) mx 450 \(\upmu \) m。这些样本通过循环变形条件下的原位扫描电子显微镜微压痕进行机械表征。随后通过氦离子显微镜评估结构失效。 3D 微米受电弓表现出复杂的机械性能，其中一些与 2D 受电弓织物的机械性能一致，同时还发现了新的性能，例如耗散响应和软化。尽管如此，3D 微米受电弓表现出强大的抗变形能力，并增强了对不良平面外运动的抵抗力，表明它们在先进工程领域的新颖应用潜力。此外，这些发现可能会优化和丰富描述缩放超材料机械行为的理论模型。